153results about How to "Small attenuation" patented technology

The invention relates to a large transformer vibration and insulation on-line monitoring device and method, and the method comprises the following steps: processing an electric signal outputted by an optical fiber sensor, and obtaining a vibration signal and a partial discharge signal of a transformer; and carrying out detection and evaluation according to the vibration signal and the partial discharge signal of the transformer. The sensors are arranged in the iron core and the winding of the transformer respectively, the same sensor can monitor two parameters of vibration and partial discharge at the same time, partial discharge defects caused by various mechanical faults of the transformer can be accurately monitored and recognized by monitoring the two parameters, the partial discharge defects are provided for operation and maintenance personnel in time for precise maintenance, and the maintenance efficiency is improved. The maintenance time is greatly shortened, and the sudden power failure fault of the transformer is effectively prevented.

The invention provides a positive active material and a preparation method thereof, a positive pole piece, a battery and electric equipment, the change rate d of the characteristic peak interplanar spacing of the positive active material (104) is greater than or equal to 0.05% and less than or equal to 0.5%, d = (d before-d after) / d before * 100%, d before is the interplanar spacing of the characteristic peak of the positive active material (104) measured by an X-ray diffractometer before circulation, and d after is greater than or equal to 0.05% and less than or equal to 100%. And d, measuring the interplanar spacing of the characteristic peak of the positive electrode active material (104) by an X-ray diffractometer at 45 DEG C after circulation for 80 weeks. Therefore, the interplanar spacing change rate of the positive electrode active material before and after circulation is small, which shows that the crystal structure stability of the positive electrode active material is good, the positive electrode active material is not easy to pulverize in the long-term circulation process of the battery, and the cycle performance of the battery can be improved.

The embodiment of the invention discloses an ultrasonic harmonic image generation method and device, electronic equipment and a medium. A specific embodiment of the method comprises the following steps: controlling an ultrasonic transmitting probe to transmit a low-frequency ultra-harmonic signal; controlling an ultrasonic receiving probe to receive the echo signal set to be detected; carrying out compressed sampling processing on the echo signal set to be detected and then carrying out signal reconstruction to obtain a reconstructed echo signal set; carrying out delay superposition processing on the reconstructed echo signal set to obtain a superposed echo signal; performing signal filtering decomposition processing on the superposed echo signals to obtain a super-harmonic signal set; performing envelope detection on the super-harmonic signal set to obtain an echo amplitude information set; and generating a target area ultrasonic harmonic image set, and sending the target area ultrasonic harmonic image set to a target terminal for display. According to the embodiment, by transmitting the low-frequency signal and receiving the ultra-harmonic signal, the attenuation of the received signal can be reduced, the signal penetration depth can be improved, the purity of the received signal can be improved, and the quality and the resolution of the generated ultrasonic harmonic image can be improved.

The invention provides a potentilla fruticosa extract for preventing and treating ovarian function decline as well as a preparation method and application of the potentilla fruticosa extract, and belongs to the field of traditional Chinese medicines. The preparation method comprises the following steps: crushing the potentilla fruticosa, adding an ethanol water solution, extracting, refluxing, filtering, and removing ethanol and water from filtrate to obtain a potentilla fruticosa crude extract; extracting the crude extract with petroleum ether, and removing the petroleum ether to obtain a refined product of the potentilla fruticosa; and carrying out spray drying on the refined product to obtain the potentilla fruticosa extract. The extract prepared by the method is stable in physical property, easy to store and transport, simple in preparation process and convenient to operate; meanwhile, in the production process, no 1-3 types of organic solvents are used, so that the method is green, environment-friendly and good in safety. The potentilla fruticosa extract has a good effect of preventing and treating ovarian function decline.

The invention discloses a vehicle energy management method. The method comprises the following steps: acquiring a preset vehicle operation condition; constructing a state variable equation and a control variable equation under a preset vehicle operation condition, and determining an algebraic constraint equation based on the state variable equation and the control variable equation; constructing a fuel cell attenuation equation based on the vehicle operation load and the vehicle start-stop times; constructing an ampere-hour circulation equation of the power battery; solving the algebraic constraint equation on the basis of a nonlinear programming method by taking the fuel cell attenuation amount and the power cell ampere-hour circulation amount as target quantities and aiming at prolonging the service life of the fuel cell and the service life of the power cell in a preset vehicle working condition to obtain an optimal state variable and an optimal control variable; and performing energy management on the fuel cell hybrid vehicle based on the optimal state variable and the optimal control variable.

The invention relates to the field of air hydrogen production, and provides an air hydrogen production material, a preparation method and application. The invention discloses a material for producing hydrogen from air, graphene aerogel and an MOF material, the graphene aerogel can absorb solar energy and convert the solar energy into heat energy, and the MOF material can adsorb water vapor in the air and catalyze a reaction for producing hydrogen under the illumination of the sun. The preparation method of the air hydrogen production material comprises the following steps: preparing a precursor solution containing graphene oxide, a polymer binder and an MOF material as required to form a solid compound, and then carrying out vacuum freeze-drying reduction treatment. The material can adapt to different application scenes, realizes distributed hydrogen production, and is suitable for efficient hydrogen production in diversified environments.

The utility model relates to the technical field of cables, and provides a corrosion-resistant high-voltage insulated cable, which comprises two compressed conductor wires, the two conductor wires respectively adopt a 1553B data line and a GSWF-3507 high-frequency low-loss stable-phase cable, the exteriors of the two conductor wires are respectively wrapped with a micropore belt, and the exteriors of the micropore belts are provided with insulating layers; an aluminum foil layer is arranged outside the two insulating layers, a shielding layer is arranged outside the aluminum foil layer, and a sheath is wrapped outside the shielding layer. The scheme has the characteristics of wear resistance, cold resistance, aging resistance, corrosion resistance and the like, and ensures stable transmission of signals among equipment.

The invention belongs to the technical field of weld joint hot crack evaluation, and particularly relates to an efficient evaluation method for weld joint hot crack sensitivity based on machine vision. A welding hot crack is manufactured by carrying out a three-point bending test on the back of a welding seam in the later solidification period, the welding seam part is transversely covered and scanned by means of a laser rectangular surface light source, a high-resolution CCD is used for collecting a welding seam picture under laser irradiation in real time, and edge information of a crack and shadow combination is recognized through an image processing algorithm. And calculating the crack rate to evaluate the heat crack sensitivity of the weld. The technical problems that an existing hot crack evaluation method is tedious in procedure and low in detection efficiency are solved.

The invention relates to the technical field of fault diagnosis of optical cables, in particular to a fault diagnosis system and method for a central beam tube type OPGW (Optical Fiber Composite Overhead Ground Wire) optical cable, and the system comprises an error rate monitoring unit which is used for monitoring the error rate of the optical cable; the self-excitation unit is used for changing the transmission frequency of an optical signal in the optical cable; the optical signal attenuation monitoring unit is used for monitoring the optical signal attenuation of the optical cable; the central control unit is used for determining whether the communication quality of the optical cable meets the standard or not according to the first optical signal attenuation amount, determining the reason that the communication quality of the optical cable does not meet the standard based on the comparison result of the first optical signal attenuation amount and the second optical signal attenuation amount, and adjusting the parameters of the optical signal according to the reason, or adjusting the communication quality of the optical cable according to the parameter adjustment. And determining the optical fiber with the fault. The method can improve the diagnosis precision of the potential fault of the optical cable.

The invention discloses functional eye-protecting soft sweets capable of resisting oxidation and reducing apoptosis of eye cells and a preparation method. The functional eye-protecting soft sweets comprise the following components in percentage by weight: 2-10% of functional components and the balance of auxiliary materials, the functional components comprise at least one of blueberry anthocyanin, lutein ester, zeaxanthin, astaxanthin, lycopene and beta-carotene, as well as vitamin C and / or vitamin E. The functional soft sweets provided by the invention have the effects of removing DPPH free radicals and reducing eye apoptotic cells, and compared with soft sweets without vitamin C / vitamin E, the vitamin C / vitamin E added in the formula can reduce the attenuation degree of functional nutrients in the effective period.

The invention discloses an acoustic emission detection device for early loosening of a bolt. The acoustic emission detection device comprises a signal acquisition board, an acoustic emission sensor, a pre-amplifier, an acoustic emission acquisition instrument and a display, the signal acquisition plate is a square thin steel plate, one-dimensional acoustic black hole structures are arranged on three boundaries, and a two-dimensional acoustic black hole structure is embedded in the center; the acoustic emission sensor is adhered to the back surface of the two-dimensional acoustic black hole structure and is used for acquiring an acoustic emission signal generated by early loosening of the bolt; the sensor is connected with an acoustic emission acquisition instrument through a preamplifier, and the acquisition instrument is connected with a display through a data line so as to display monitored acoustic emission signals in real time. According to the invention, the precision and sensitivity of bolt looseness detection, especially early looseness detection of a bolt structure, can be effectively improved, structural failure is prevented, and safe operation of equipment is guaranteed; the device has the advantages of simple structure, accurate detection, convenient operation and the like.

The invention discloses a deep sea cable fault accurate positioning method based on electromagnetic induction and transient characteristic analysis, and relates to deep sea electric power engineering. According to the technical scheme, the method comprises the steps of 1, signal excitation used for transmitting a signal source; 2, signal filtering is carried out to counteract geomagnetic background noise; 3, signal correction is carried out to solve the problems of modal aliasing and endpoint effect existing when a traditional EMD is used for processing complex signals; 4, signal feature extraction, wherein transient pulse features in the signals can be effectively enhanced; and step 5, fault positioning. The method is mainly used for non-intrusive fault detection of the power cable in the kilometer-level deep sea high-pressure environment, and high-precision fault point positioning is achieved.

The invention relates to the technical field of laser communication, in particular to a free space optical communication system, device and method. According to the free space optical communication system provided by the invention, the space light beam is firstly coupled with the multimode optical fiber, and the characteristic that the diameter of a fiber core of the multimode optical fiber is larger is utilized, so that the coupling efficiency is improved, and the energy loss in the coupling process can be effectively reduced. Then, a mode demultiplexer is used, and a mode conversion technology is adopted to separate and convert multiple modes of light in the multimode optical fiber, so that the obtained LP01 mode is separated and converted into a fundamental mode of the single-mode optical fiber to serve as an output optical signal, and the problem that the modes of the multimode optical fiber and the single-mode optical fiber are not matched is solved through the mode conversion technology; and finally, the converted fundamental mode signal in the single-mode fiber is used for communication, so that a high-speed communication module can be better matched.

The utility model discloses a high temperature and high pressure resistant radio frequency cable for a nuclear power station, which comprises an inner conductor, the inner conductor is arranged at the central position of the radio frequency cable, an insulating layer, a shielding layer and a sheath layer are sequentially coated on the circumference of the inner conductor from the inner layer to the outer layer, the radio frequency cable also comprises an outer armor layer, and the outer armor layer is coated on the circumferential outer side of the sheath layer. The outer armor layer is made of metal wires. The utility model provides a radio frequency cable scheme which is extremely low in attenuation, resistant to large-dose irradiation, resistant to high temperature and high pressure and capable of meeting the requirements of low smoke, zero halogen and flame retardance.

The invention discloses an intelligent monitoring high-flame-retardant water-blocking long-distance symmetrical communication cable, which comprises a communication line group, a plurality of intelligent monitoring units, a flame-retardant structure, a water-blocking structure, a shielding structure, an oxygen isolation structure and an outer sheath, and is characterized in that the plurality of intelligent monitoring units are uniformly distributed along the length direction of the communication line group and form a cable core together with the communication line group; the flame-retardant structure, the water-blocking structure, the shielding structure and the flame-retardant oxygen-isolating structure are all arranged between the cable core and the outer sheath, the intelligent monitoring unit comprises a monitoring module, a data processing module and a communication module, and the monitoring module is composed of a temperature sensor, a humidity sensor, a strain sensor and a current monitor. The data processing module is electrically connected with the monitoring module on one hand, and communicates with a remote monitoring center through the communication module on the other hand, so that moisture can be effectively prevented from invading into the cable, and the cable has good transmission performance, monitoring function and water-blocking and flame-retardant performance, and can autonomously monitor the operation state and perform early warning and positioning on faults.

The invention discloses lignin-based porous carbon for a supercapacitor and a preparation method of the lignin-based porous carbon, and belongs to the technical field of electrode materials. The preparation method comprises the following steps: mixing enzymatic hydrolysis lignin, potassium carbonate and monopotassium citrate according to a mass ratio of 1: (1.75-4.375): (0.25-0.625), carbonizing, cooling, washing and drying to obtain the lignin-based porous carbon. The prepared lignin-based porous carbon has excellent electrochemical performance, in a three-electrode test with 6M KOH as an electrolyte, when the current density is 1A / g, the highest specific capacitance can reach 310F / g, the lignin-based porous carbon, the 6M KOH electrolyte and a diaphragm material are assembled into a symmetric supercapacitor, after 10000 cycles of 5A / g cyclic charging and discharging, the specific capacitance attenuation of the capacitor is small, and the specific capacitance attenuation of the supercapacitor can reach 310F / g. The capacitance retention rate is as high as 99.5%, the coulombic efficiency is close to 100%, and the cycling stability is very excellent.

The invention discloses a large ring forging inner wall flaw detection device and method, and belongs to the technical field of metal flaw detection. The flaw detection device for the inner wall of the large ring forge piece comprises a bracket and an ultrasonic detector, and further comprises a driving mechanism for driving the bracket to move on the side wall of the ring forge piece along the circumferential direction of the ring forge piece; an inner cavity of a cylinder body of the piston cylinder is communicated with a coupling agent supply device, and a piston of the piston cylinder is connected with a probe of the ultrasonic detector; the contact block is provided with an arc-shaped convex surface, the arc-shaped convex surface on the contact block is attached to the inner wall of the ring forge piece, the contact block is used for transmitting ultrasonic waves, and a liquid spraying opening is formed in the arc-shaped convex surface; and when the arc-shaped convex surface on the contact block abuts against the inner wall of the ring forge piece, the stop valve is opened. According to the flaw detection device and method for the inner wall of the large ring forge piece, the transmission distance of ultrasonic waves in air can be reduced, so that attenuation of ultrasonic signals can be reduced, the detection precision of the probe is improved, and the flaw detection precision of the inner wall of the ring forge piece is improved.

The utility model discloses a double-shielding high transmission data cable, including: insulating core wire, buffer hose, aluminum plastic composite tape, ground wire, metal braid layer and sheath, insulating core wire is formed by three insulating layer co-extrusion on the conductor, every two insulating core wire pair twist to form one group of twisted pair wire, each group of twisted pair wire is lapped with aluminum plastic composite tape, the metal braid layer is lapped with the buffer hose, the metal braid layer is lapped with the metal braid layer, the metal braid layer is lapped with the metal braid layer, and the metal braid layer is lapped with the metal braid layer. The four groups of twisted pair wires are twisted into a cable by taking the ground wire as a center, a metal braided layer is braided on the four groups of twisted pair wires which form the cable, an aluminum foil layer on an aluminum-plastic composite belt is in contact with the metal braided layer and the ground wire, a buffer hose is spirally wound on the metal braided layer at equal intervals, and the buffer hose is formed by mixing and extruding a PVC material and aluminum hydroxide particles. And a sheath is extruded on the metal braid layer, is filled in the gap of the buffer hose and is attached to the metal braid layer. The advantages of the utility model are that the cable can maintain the high-speed and high-reliability transmission performance of data signals in a conventional environment and an environment in which a fire disaster occurs or a building collapses.

The utility model discloses a buried pipeline leak detection device, which comprises a sound acquisition device and a sound generating device, the sound generating device is led in from an upper branch of a buried pipeline, floats into the buried pipeline and can flow along with water flow in the pipeline, the sound generating device is provided with generating equipment, and the generating equipment is connected with the sound acquisition device. Low and medium frequency sound can be emitted; the sound collection device is located on the ground and can detect the frequency emitted by the sound generation device. When pipeline leakage exists, the sound generating device can flow to the leakage position along with water flow, low and medium frequency sounds with different frequencies are detected through the sound collecting device, good penetrability is achieved, attenuation of the sounds in soil is weakened, and the detection accuracy can be improved by detecting the sound with the specific frequency; and meanwhile, interference of environmental noise on detection can be effectively reduced, accurate and rapid positioning of the pipeline leakage point is achieved, and the construction amount is reduced.

The invention discloses an efficient preparation method of a vanadium catalyst for sulfuric acid production, which comprises the following steps: preparing vanadium water, silica sol suspension and 1 + 1 dilute sulfuric acid solution, and converting the mass of each raw material into volume; the retention time from the time when the raw materials enter the liquid-liquid phase microreactor to the time when the reaction product flows out is controlled to be 5-10 min, the raw materials are injected into the liquid-liquid phase reactor through a constant flow pump, the reaction temperature is 50-60 DEG C, the frequency of a reactor motor is 10-25 Hz, and a vanadium-containing active material is prepared; the vanadium-containing active material and a carrier diatomite are mixed to prepare a pre-forming material, the pre-forming material is subjected to extrusion forming to obtain a vanadium catalyst semi-finished product, and the vanadium catalyst semi-finished product is dried and roasted to obtain a vanadium catalyst finished product. The vanadium catalyst prepared by the invention has the advantages of good dispersity of active components, high catalyst activity, long service life, short time consumption and low energy consumption.

The present invention provides a lure that can reduce the attenuation of external light when it is reflected from multiple parts of the lure, reflect with stronger brightness, and form reflected light in various directions, thereby being able to more effectively and strongly lure piscivorous fish. Specifically, the fishing lure involved in one embodiment of the present invention is constructed to have a main body with a cavity inside, a part or the whole of the cavity can be visually recognized from the outside, and one or more reflecting surfaces or reflectors that can specularly reflect light from the outside are respectively provided on at least any two parts of the outside of the main body, the inside of the main body, or the cavity, and the light from the outside is constructed to be specularly reflected once or more times at the at least two parts.

The invention belongs to the technical field of gravity dam topographic survey, and particularly relates to topographic survey equipment for concrete gravity dam modeling, which comprises a survey main body, a driving assembly arranged on the survey main body, a signal enhancement type earth surface pretreatment mechanism and a gravity compensation type self-adjusting survey mechanism, the signal enhanced earth surface preprocessing mechanism is arranged on one side of the lower end of the surveying main body, and the gravity compensation type self-adjusting surveying mechanism is arranged on the other side of the lower end of the surveying main body; according to the topographic survey equipment for concrete gravity dam modeling, signal attenuation and vegetation, especially vegetation containing a large amount of water, can be reduced through the signal enhancement type earth surface preprocessing mechanism, electromagnetic waves of a geological radar can be absorbed and attenuated, after the vegetation is cleaned, signal attenuation can be reduced, the penetration depth of radar signals can be increased, and therefore the effect of modeling of the concrete gravity dam is achieved. Therefore, the underground structure can be better detected.

The application provides a steam delivery pipeline leakage detection system, which comprises a metal conducting rod fixedly connected to the outer wall of a steam delivery pipeline, a sensor connected to the metal conducting rod, a signal analyzer electrically connected to the sensor, and a DCS control center electrically connected to the signal analyzer, and the sensor is used for collecting the vibration sound signal of the metal conducting rod. The steam delivery pipeline leakage detection system of the application can accurately and timely determine the leakage and the position of the leakage point by using the metal conducting rod connected to the steam delivery pipeline to transmit the vibration sound generated by the intense friction between the leakage medium and the pipeline wall, and the sound signal is not obviously attenuated in the transmission process due to the solid medium transmission, the transmission distance is long, and the sound signal is not easily interfered by other signals, the false positive rate of the leakage detection is effectively reduced, the operation and maintenance cost of the steam delivery pipeline is significantly reduced, and the industrial safety is improved.

The present invention belongs to the field of nuclear physics and nuclear technology application, in particular to a large curved thin-walled neutron beam window for a high-resolution neutron diffractometer in spallation neutron source technology and a manufacturing method thereof; the neutron beam window is designed as an integrated curved structure, the thickness of the beam window is designed to be 1.5 mm, and a transverse rib is provided in the middle of the neutron beam window to enhance structural stability without affecting neutron penetration; the present invention is designed as a thin-walled curved structure, so that the neutron beam window can more effectively penetrate neutrons, reduce neutron attenuation during transmission, thereby improving neutron utilization and accuracy of experimental data; at the same time, compared with a traditional planar structure, the curved surface design has better stress distribution, can effectively reduce stress concentration and mechanical deformation, improve the pressure bearing capacity and fatigue life of the neutron beam window, and ensure safe and stable operation of the experimental device.

The invention discloses a liquid cooling energy storage cabinet which comprises a main frame, the interior of the main frame is divided into an energy bin and an electric appliance bin which are mutually independent through a vertically-arranged partition plate, a battery rack is arranged in the energy bin, battery packs are detachably installed in the battery rack, a liquid cooling plate is tightly attached to the side face of each battery pack, and a flow channel is formed in each liquid cooling plate. The flow channels of the adjacent liquid cooling plates are connected in series through liquid cooling pipelines; an inlet and an outlet of the liquid cooling pipeline both extend to the electric appliance bin and are connected with an outlet and an inlet of the liquid cooling unit respectively, and the liquid cooling unit is fixed to a bottom plate of the electric appliance bin through a liquid cooling air conditioner support. Through the design that the liquid cooling plate is directly attached to the side face of the battery pack, the heat conduction path is extremely short, the advantages of high specific heat capacity and high heat conductivity of liquid are utilized, heat generated during charging and discharging of the battery can be rapidly and efficiently taken away, and the problem of low heat dissipation efficiency caused by low specific heat capacity and poor heat conductivity of air in air cooling is solved.

The invention discloses a bottom plate impact positioning method for a storage tank bottom plate in an oil detection robot, and relates to the technical field of robot positioning, and the method comprises the following steps: 1, arranging a plurality of ultrasonic receivers at the bottom of the outer side wall of a storage tank; 2, a storage tank bottom plate is located in the storage tank and located on a bottom plate of the storage tank; an ultrasonic generator of the storage tank bottom plate on the oil detection robot sends an excitation signal to the bottom plate, energy of the excitation signal is transmitted into the bottom plate to form an acoustic pulse signal diffused to the periphery, or the storage tank bottom plate on the oil detection robot sends the acoustic pulse signal in a mode of mechanically impacting the bottom plate; and 3, a plurality of ultrasonic receivers located outside the storage tank capture the sound pulse signals, and the position of the storage tank bottom plate on the oil detection robot is calculated through a positioning algorithm. The bottom plate impact positioning method of the storage tank bottom plate on the oil detection robot solves the problems of high attenuation and high error of sound pulse signals, and can be suitable for storage tanks with large diameters.

The invention relates to a smoking behavior detection method based on an improved YOLOv5s model, and belongs to the field of target detection. Comprising the following steps: collecting a smoking behavior image, and carrying out preprocessing, image enhancement and annotation on the smoking behavior image to construct a data set; constructing a smoking behavior detection model, training the smoking behavior detection model based on the data set, performing positive sample expansion in the training process, and obtaining a trained smoking behavior detection model after the training is completed; and inputting a to-be-detected image into the trained smoking behavior detection model to realize smoking behavior detection. According to the method, the calculation efficiency is improved by improving the activation function, the model convergence speed and the target detection precision are improved by improving the loss function, and the problems that an existing smoking behavior detection method is low in real-time performance and low in accuracy are solved.

This utility model relates to the field of lithium-ion battery manufacturing and discloses a soft-pack lithium-ion battery and electronic product. The soft-pack lithium-ion battery includes: a cell body and an aluminum-plastic film shell for sealing the cell body. A plastic film heat-sealing strip is provided on the aluminum-plastic film shell. On the plastic film heat-sealing strip, the polypropylene layers on the surfaces of the bottom aluminum-plastic film and the top aluminum-plastic film are fused and sealed together. The plastic film heat-sealing strip seals the cell body in the cavity between the top and bottom aluminum-plastic films. Except for the ends where the tabs protrude, the inner and outer surfaces of the top and bottom aluminum-plastic films are exposed metal layers. The exposed metal layers are fused together metallurgically and, after cooling, form a sealed metal sealing strip located outside the plastic film heat-sealing strip layer.

The invention discloses an all-quartz multi-component Raman signal online detection module based on multi-laser additive and subtractive manufacturing. The all-quartz multi-component Raman signal online detection module comprises a node-free negative curvature hollow-core optical fiber with side micropores, a multimode optical fiber, a single-mode optical fiber plated with a ceramic film, a semicircular micro-channel, a quartz slurry packaging layer and a quartz fixing base, a micro-scale micropore is processed on the side surface of a node-free negative-curvature hollow fiber by utilizing picosecond laser, a multimode fiber, the node-free negative-curvature hollow fiber with the side micropore and a single-mode fiber are welded into a whole, the single-mode fiber is ground into a slice by utilizing an optical fiber grinding technology, and a ceramic membrane is deposited on the end surface of the slice single-mode fiber. Picosecond laser is used for scanning the quartz fixing base layer by layer so as to process a semicircular micro-channel for placing the sensor, and CO2 laser is used for scanning, depositing and curing the quartz slurry packaging layer layer by layer so as to package the sensor. According to the invention, the to-be-detected substance is injected into the all-quartz sensor, so that on-line detection of multi-component Raman signals can be realized in high electromagnetic interference environments such as electric power and the like.

The present invention discloses a two-core precise positioning optical fiber sensing early warning alarm system, wherein the laser transmitter is a square wave signal transmitter, which transmits a square wave signal to the forward input port of the annular optical module; the forward output port of the annular optical module is connected to the forward input port of the bidirectional splitter, the bidirectional splitter divides the square wave into two, and transmits the square wave to one end of the forward core of the two-core optical fiber through the forward output port, the output end of the light refraction module is connected to the input end of the reverse core of the two-core optical fiber, the reverse output port of the bidirectional splitter is connected to the reverse input port of the annular optical module, the reverse output port of the annular optical module is connected to the laser detector, and the laser detector is connected to the signal input port of the signal processing module. The present invention utilizes an optical fiber reflector, reduces one core optical fiber, and reduces the attenuation of the entire link by one half, thereby increasing the length of optical fiber detection from the original 110 kilometers to 180 kilometers.